Python Functions and Parameters Quiz

What keyword is used to define a function in Python?

• function

• def

• define

• lambda

Answer explanation

In Python, the keyword 'def' is used to define a function. The other options, 'function', 'define', and 'lambda', are not valid keywords for this purpose. Therefore, 'def' is the correct choice.

What is the output of the following code? def my_function(): return 5 print(my_function())

• 5

• None

• my_function()

• Error

Answer explanation

The function my_function() returns the value 5. When print(my_function()) is called, it outputs the return value of the function, which is 5. Therefore, the correct answer is 5.

Which of the following is true for procedures in Python?

• They always return a value

• They are defined using def

• They cannot take arguments

• They are not supported in Python

Answer explanation

In Python, procedures (functions) are defined using the 'def' keyword. They can return a value, and they can also take arguments, making the statement 'They are defined using def' the only true option.

What does the following code output? def greet(name="User"): print(f"Hello, {name}") greet()

• Hello, User

• Hello, name

• None

• Error

Answer explanation

The function greet has a default parameter 'name' set to 'User'. When called without arguments, it uses this default value, resulting in the output 'Hello, User', which matches the correct answer choice.

What is a parameter?

• The name of a function

• A value returned by the function

• A variable defined in the function header

• A keyword to end a function

Answer explanation

A parameter is a variable defined in the function header that allows you to pass information into the function. It is not the function's name, return value, or a keyword to end a function.

What is an argument?

• A placeholder for code

• A variable defined inside the function

• A value passed to a function when called

• A condition for the function

Answer explanation

An argument is a value passed to a function when it is called. This allows the function to operate on different data inputs, making it flexible and reusable.

What will the following code return? def add(a, b): return a + b print(add(2, 3))

• 2

• 3

• 5

• None

Answer explanation

The function 'add' takes two arguments, 'a' and 'b', and returns their sum. When calling 'add(2, 3)', it computes 2 + 3, which equals 5. Therefore, the correct answer is 5.

What happens when a list is passed to a function?

• A copy of the list is passed

• The original list is passed (by reference)

• The list is converted to a tuple

• It raises an error

Answer explanation

When a list is passed to a function in Python, the original list is passed by reference. This means that any modifications made to the list within the function will affect the original list outside the function.

What is the correct way to call this function? def multiply(x, y): return x * y

• multiply()

• multiply(2)

• multiply(2, 3)

• function multiply(2, 3)

Answer explanation

The function multiply requires two arguments. The correct way to call it is multiply(2, 3), which provides both required parameters. The other options either lack arguments or are incorrectly formatted.

What will this code output? def change_value(x): x = 10 value = 5 change_value(value) print(value)

• 10

• 5

• None

• Error

Answer explanation

The function change_value modifies the local variable x to 10, but this does not affect the original variable value outside the function. Therefore, when we print value, it remains 5.